3sk41 Datasheet
Gate 2 can be used for Automatic Gain Control (AGC), allowing the amplifier's gain to be adjusted without significantly affecting the input impedance.
Summary: the 3SK41 is an N‑channel dual‑gate MOSFET (small RF/low‑power device in a CAN/TO‑style metal can) used historically in VHF/UHF tuner and RF front‑end circuits. Below I break down what a datasheet for this part usually contains, explain the key specs, show how they affect circuit behavior, give practical tips for selection, testing, PCB layout and replacement/cross‑reference, and include simple application examples.
It was a staple in radio frequency (RF) circuits, specifically for VHF/UHF amplifiers and mixers in televisions and FM tuners. Design Advantage:
The core advantage of using the 3SK41 over a single-gate FET or a standard bipolar junction transistor (BJT) is the internal cascode configuration.
As OEM supplies have dried up, restorers have identified several suitable replacement options, though each comes with its own considerations. 3sk41 datasheet
V(BR)DSScap V sub open paren cap B cap R close paren cap D cap S cap S end-sub ) : 20V minimum. Gate 1 / Gate 2-Source Breakdown Voltage (
When working with a 3SK41, remember that MOSFETs are highly sensitive to . Even a small spark from your fingertip can puncture the thin oxide layer of the gates, destroying the transistor. Always use an anti-static wrist strap and a grounded soldering iron when handling these components.
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, typically used in high-frequency applications like VHF/UHF amplifiers or mixers. It is manufactured by brands such as Censtry.com Key Technical Features According to technical listings from , the 3SK41 offers: Dual-Gate Architecture Gate 2 can be used for Automatic Gain
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: Minimizes loading on the preceding stage.
The key electrical thresholds and operating limits defined in the official include the following core parameters: Drain-Source Breakdown Voltage (
Without a current datasheet, we can't confirm the exact specifications of the 3SK41. For JFETs in general: It was a staple in radio frequency (RF)
Ideal for front-end RF amplifiers, ensuring high signal-to-noise ratios.
The dual-gate structure of the 3SK41 makes it highly versatile in discrete RF receiver front-ends:
The 3SK41 typically comes in a metal-can package (similar to TO-72) with four leads. Proper identification of the leads is critical for circuit stability.